Were they U.S. citizens when Marco was BORN? They were not, THAT is what is relevant.
Rubio is certainly a 14th amendment citizen and a statutory citizen, but he is not a natural-born citizen as the Supreme Court said in Wong Kim Ark that the 14th amendment does not define nor redefine natural-born citizenship. It is defined as all children born in the country to parents who WERE its citizens ... not born to parents who BECAME its citizens. The court ruled that the 14th amendment made citizens of children born to resident aliens, the latter satisfying the subject clause through permanent residence and domicil. Obama, incidentally, meets neither definition, since his parents were not both citizens and did not have permanent residence and domicil in the United States.
No... He is a citizen by birth no different than any “anchor baby”, not a Natural Born Citizen as defined by the Constitution and Common Law on whiuch the Constitution is based.
You can turn it and twist it anyway you want, but unless you propose ignoring the Constitution, it changes nothing.